Could use help for problems 4 and 5 about optimization using calculus 1 techniques. Thank you.

(4) The area of 20 ft of a wooden board may be used to build a box. The base of the box must be a rectangle whose ratio of the sides is 2 : 3. What are the dimensions of the box that maximize its volume? (5) Find the point on the line 6x + y = 9 that is closest to the point (-3, 1) (Check your answer with the grapher) the area of rectangles inscribed in the right triangle with lengths of sides 5